Senior Firmware Engineer

Littelfuse (NASDAQ: LFUS) is a diversified industrial technology manufacturing company shaping solutions for the safe and efficient transfer of electrical energy. Headquartered in Chicago, Illinois, USA, we serve customers across industrial, transportation, and electronics markets worldwide. With approximately 16,000 employees we design and manufacture innovative technologies that support electrification, energy efficiency, and advanced automation. Our global reach is matched by a culture that empowers innovation and long‑term growth. Guided by our principles We Care, We Succeed With Our Customers, and We Own the Outcome, we work collaboratively, think boldly, and deliver solutions that move industries forward.

As a Senior Firmware Engineer, you will be responsible for the embedded firmware architecture, design, unit level and system testing of new solid‑state components and systems. The candidate must be self‑motivated and comfortable navigating uncertainties and customer‑driven design requirements. The role requires an understanding of the protection legacy that Littelfuse has established and the ability to collaborate across the business to draw upon that strength. Join the team at Littelfuse that is developing new, self‑contained smart components and systems that deliver protection and control functionality to electrical systems.

About the Job

Develop and qualify embedded designs as part of a safety critical component or system. Establish and execute unit level and system level tests and work with QA engineers to develop automated robust test suites. Establish a safety critical software process that meet requirements of UL 1988, IEC 60730, IEC 61508, and ISO 26262. Develop DFMEA for safety critical components and systems. Engage with contract manufacturers or in house manufacturing to implement design, prepare design documentation, and evaluate production processes to assure components meet performance, reliability and cost targets. Support occasional travel as required to evaluate suppliers and support production ramp up. Develop and execute protection system component and system qualification and reliability test plans. Provide regular project updates as part of the overall project planning and execution.

About you

MS in Electrical Engineering, Computer Science or BS in Electrical Engineering, Computer Science with equivalent experience. 10+ years of hands‑on experience designing embedded firmware for 32‑bit/64‑bit ARM architectures, including experience with bare‑metal and RTOS based developments (Free RTOS, Zephyr). Experience with communication protocols (SPI, I2C, UART, Modbus, CAN, Ethernet). Working knowledge of cryptography, algorithms and encryption for embedded devices. Hands on experience with hardware bring‑up, debugging tools (JTAG, oscilloscopes, logic analyzers). Experience developing firmware for safety critical applications, including the ability to support product compliance testing. Demonstrate an entrepreneurial spirit, willingness to experiment and be able to manage ambiguity.

Littelfuse strives to empower associate growth and development in a culture of ongoing collaboration and respect for diverse global perspectives and expertise.

Our Core Values – We Care, We Succeed With Our Customers, We Own The Outcome – support us in our mission to improve the safety, reliability, and performance of our customers’ products that use electrical energy.

We are an equal‑opportunity employer that takes pride in giving every associate the means and courage to make a difference – everywhere, every day.

#LI-EW1 At Littelfuse, we support employee growth and development. Guided by our culture principles, our teams work together to deliver value for customers and make a positive impact in the communities where we operate. We are an equal opportunity employer committed to fostering an inclusive workplace where everyone has the opportunity to grow and contribute.

• competitive compensation and benefits
• performance‑based incentives
• flexible work arrangements
• development opportunities

Our humble roots date back to 1927, where, in the back of a garage on Chicago’s northside, our founder, Edward Sundt, developed a small, fast‑acting, protective fuse for use in sensitive test meters. Sundt wanted to call his new company producing these small fuses, “Little Fuse,” but wasn’t allowed to trademark two such common words. So, instead he went with the one‑word, misspelled “Littelfuse.” For more than 95 years, Littelfuse has pioneered innovative products that help empower a sustainable, connected, and safer world. With the ever‑evolving electrification and electronification of customer applications, our product technologies are closely linked to sustainable applications such as electric vehicles and EV charging infrastructure, renewable energy and energy storage, factory automation, power management and more. Throughout our history, our people have been the foundation of our success — and that remains true today. Now more than ever, our bright and talented people are a strategic advantage for the company. From the production line to the engineering lab, the office or distribution center, Littelfuse people are an important part of a diverse, talented team of the best and brightest in the industry. While Littelfuse has experienced tremendous growth in recent years, we still maintain a small‑company, entrepreneurial approach where your efforts will drive our culture, our business, and the overall success of the organization. No matter where your work or what we do, your contributions will make a difference at Littelfuse — everywhere, every day.

Littelfuse is an Equal Opportunity/Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, gender identity, sexual orientation, disability, protected veteran status, and/or any other protected class under federal, state, or local law.